
A-78640E
Sheet
Title
Draw
No.
04 Feb.08.’03 Part of (4) is added or modified. Addition of 2.16.5
03 Jul.02.’02 A. Fukumoto Part of (3) is added or modified. T.Endo
02 May.13.’02 A. Fukumoto Addition of Tool Radius control for 5-axis machining etc T.Endo
Ed. Date Design Description
Date Jan.25.’02 Desig. A.Fukumoto Apprv. T.Endo
FANUC Series 16i /18i -TB
Specifications of AI High-Precision Contour Control /
I Nano High-Precision Contour control
123/190
Let the torque be x (Nm), the inertia be y(Kgm
2
), and the ball screw pitch p(mm),
then the acceleration A is calculated as follows:
]sec/[
2
][
2
][
])][sec/([
][
2
][
][
2
2
2
2
mm
y
px
mm
p
kgmy
mkgmx
mm
p
kgmy
Nmx
A
×
×
=
×=×=
π
ππ
Machine specification is assumed as follows,
Ball screw pitch : 16 (mm)
Inertia : The machine inertia is to be 2.0 times higher than that of
the rotor.
(Rotor inertia: 0.0099 (Kgm
2
))
The acceleration at maximum torque is,
]sec/[7717
0099.00.32
1690
2
mm=
××
×
π
The acceleration at rapid traverse is,
]sec/[5916
0099.00.32
1669
2
mm=
××
×
π
From the above data, the parameters related to acceleration pattern is given in
the table below.
The example assumes that the acceleration is the same regardless of whether
acceleration or deceleration is in progress or whether the movement is in the
plus or minus direction.
Table. 2.24(c) Example of setting parameters related to acceleration pattern
Parameter
No.
Setting Unit Remarks
Rapid
traverse
rate
1420 48000. mm/
min
The ball screw pitch is assumed 16
mm, so that the rapid traverse rate is
48000 mm/min at the maximum
speed 3000 (min
1−
).
Referen
ce
acceler
ation
1773 194 msec Reference acceleration is
= 4124 (mm/sec
2
)
Speed
at P1
19541 6666 0.01% 66.66% is set at P1 because the
torque 90(Nm) is constant up to 2000
(min
1−
) (32000mm/min).
0.6666=32000/48000
Speeds
at P2 to
P4
19542 to
19544
0 0.01% P2 to P4 are skipped because the
torque drops almost linearly from the
speed 2000 (min
1−
) to 3000
(min
1−
).
Acceler
ation at
P0
19545,19551
19557,19563
18712 0.01% At P0, 90(Nm) can be used for the
acceleration/deceleration, so set the
ratio 7717 (mm/sec
2
) to 4124
(mm/sec
2
).
1.8712 = 7717/4124
48000/60
194/1000